Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT IN AMAK - Summary of Financial Position (Details)

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INVESTMENT IN AMAK - Summary of Financial Position (Details) - AMAK [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Current assets $ 33,273 $ 23,333
Noncurrent assets 228,733 237,875
Total assets 262,006 261,208
Current liabilities 22,873 24,439
Long term liabilities 71,520 68,837
Shareholders' equity 167,613 167,932
Total liabilities and Shareholders' equity $ 262,006 $ 261,208